There are too many! Here are some:
"Hedyn pob drwg yw diogi. (The seed of all evil is laziness.)"
"Mighty oaks from little acorns grow."
"It is better to light a candle than scorn the darkness."
"A journey of a thousand miles begins with a single step."
"I detest life insurance agents. They always try to tell me that I shall someday die, which is not so."
"A black cat crossing your path tells you the animal is going somewhere."
"All you need is love. But a little chocolate now and then doesn't hurt."